EP 0055164 B1 19850403 - PROCESS FOR PREPARING ALUMINA AGGLOMERATES
Title (en)
PROCESS FOR PREPARING ALUMINA AGGLOMERATES
Publication
Application
Priority
FR 8027299 A 19801223
Abstract (en)
[origin: EP0055164A1] 1. Process for preparing alumina pellets, comprising the following steps : a) activated alumina pellets are treated in an aqueous medium consisting of a mixture of at least one acide making it possible to dissolve at least a part of the alumina of the pellets and at least one compound providing an anion capable of combining with aluminium ions in solution ; b) the pellets treated in this way are simultaneously or subsequently subjected to a treatment at a temperature of between 80 degrees C and 250 degrees C for a period of between a few minutes and 36 hours ; c) the pellets are, if appropriate, dried and subjected to thermal activation at a temperature of between approximately 500 degrees C and approximately 1,100 degrees C ; and at most 15% by weight of alumina of the pellets, the acid being chosen from among the strong acids or the weak acids, its concentration in the aqueous treatment medium being below 20% by weight and preferably between 1% and 15% and the compound providing an anion A**-n forms with the aluminium ions Al**3+ in solutions products in which the atomic ratio n(A/Al) =< 3, and the concentration of this compound in the aqueous treatment medium is below 50% by weight and preferably between 3% and 30%.
IPC 1-7
IPC 8 full level
B01J 20/08 (2006.01); B01J 21/00 (2006.01); B01J 21/04 (2006.01); B01J 35/10 (2006.01); C01F 7/02 (2022.01)
CPC (source: EP)
B01J 20/08 (2013.01); B01J 20/3028 (2013.01); B01J 20/3078 (2013.01); B01J 20/3204 (2013.01); B01J 20/3234 (2013.01); B01J 21/04 (2013.01); C01F 7/02 (2013.01); C01P 2004/50 (2013.01); C01P 2006/10 (2013.01); C01P 2006/12 (2013.01); C01P 2006/14 (2013.01); C01P 2006/16 (2013.01)
Designated contracting state (EPC)
BE CH DE FR GB IT LI NL
DOCDB simple family (publication)
EP 0055164 A1 19820630; EP 0055164 B1 19850403; BR 8108329 A 19821005; CA 1153353 A 19830906; DE 3169756 D1 19850509; ES 508236 A0 19830216; ES 8304035 A1 19830216; FR 2496631 A1 19820625; FR 2496631 B1 19890630; JP H0220567 B2 19900509; JP S57123821 A 19820802; MX 161570 A 19901106
DOCDB simple family (application)
EP 81401959 A 19811209; BR 8108329 A 19811222; CA 392956 A 19811222; DE 3169756 T 19811209; ES 508236 A 19811222; FR 8027299 A 19801223; JP 20258281 A 19811217; MX 19050081 A 19811209